Gauge



April 8 1924. 1,489,575

B. M. w. HANSON GAUGE Fil ed Apri l 16. 1921 gnve'ntoz peculiarly applicable. It is to be understood Patented A r. 8, 1924.

' Unwed-ST T S mom I. w; HANSON, or narrow), comers. v

GAUGE.

To aZZ'whom-z't may concern: I Be it'known that I, BENGT M. W. HAN- SONYH. citizen of the United States, and resident of Hartford, county'of Hartford, State of Connecticut, have invented'certain new and useful Improvements in Gauges, of'

which the following is aspecification.

This invention relates to gauges. .In-the present illustrative disclosure, the inventionis shown as incorporated in a gauge f 0r screw threaded members, to which use 1t is that the present disclosure is by way of illustration only, as the invention is susceptible of other embodiments. than those herein shown.

The aim of the invention is to provide a gauge having various features of novelty and. advantage, and more particularly to provide a device of this sort with which threaded members may be Very readily and accurately gauged .Within predetermined limits of tolerance.

In the accompanying drawing, Fig. 1 is a side e evatlon of a gaugeillustrating one embodiment of the present invention, looking in the direction of the arrow 1 of Fig. 3. I

Fig. 2 is a cross sectional View thereof looking in the direction of the arrow 2, Fig. 3.

- Fig. 3 is the sectional view takenon line 3-3 of Fig. 1, looking in the direction of the arrow 3.

Fig. 4 is a view similar to Fig. 1 but illustrates another embodiment of the invention.

Referring to that embodiment of the ine vention. shown in Figs. ,1 to 3 inclusive, a: is a frame in the form of a C having a pair of heads 9, 10 on the opposed faces of which are mounted jaws b, 0, each of which, in the present instance, comprises a single member or block. The opposed jaw faces are prosame direction. In Fig. 3, the line s'-s de- Application filed April 1a, 1921. Serial no. 451,350. v f

notes the central to 'which the serrat1ons11, 12, areoppositely inclined at like angles. The axis-"of the threaded member,

viiheninserted beaween thejaws, will be at right angles to"--t s plane indicated by the transverse will be understood that the" pit'clhof; the serrations of each jaw face corresponds with the pitch of the thread to begauged- To-accommodatetheleadof the thread to" be gaugedfoiie of the jaw members, in the present i nstahce the member I), is mounted for "transv rse movement in the direction of the jlifletL-t. To this end, the block b is rovidfle d fwith a tongue .14 having a sliding groovei15 in the head 9 and this.

t mi-a1 block is resiliently held to its seat by a spring 16 coiled about a screwf17 threaded into the block and extending through a slot 18 in the head.

For the" purpose of gauging threaded i memberswithin specified working allowances or tolerances, the arrangement is such that the \jaws are slightly inclined toward one another in a direction longitudinally of the serrations and indicating means are provided to denotethe respective points past which a threaded member should and should not go tb be within; the specified limits of accuracyalso'means are provided for ad-. justing th e faces ij'elativeto one another to permit of variation in working allowances and to take 1.11 wear.- To these ends, in the embodiments own in Figs. 1 to 3, the jaw member c-is adapted to be adjusted by a wedge 20 so that the-j aw faces are longitudinally-inclined relative to one another, that is, in the direction of. the line 8-8. The wedge 20 isipositioned;in an inclined groove 26 extending transversely of the head 10,

and is adjusted bya'screw 27. The jaw member cis'; secured to the head by'a screw 28 therebe ng suflicient play betweenthe 'parts to permit of angular adjustment thereof. Thismjember 0, adjacent its'rearend, is supported by an adjustable screw, 29 which constitutesfi the fifulcrum, for the member c when the latter is adjusted by means of the wedge. Thejaw face of the member 0 is transversely'grooved as at 21 and the for- I ward edge 22 of this groove' may be employed to indicate the point past which the threaded member must go to be below the maximum limit of accuracy, and the rear edges 23 of .the. serrations 11, 12 may be employed to indicate the point past which .that the gauge is particularl the threaded member should not go to be above the minimum limit of accuracy. On theside face of the member I; is a scale 24- which is of assistance in determining the exact diameter of the threaded member.

Assuming, for purposes of illustration, constructed for measuring threaded mem ers one inch in diameter, and the specified limits of accuracy for the particular threaded member to be gauged are one inch and one inch minus .002, the procedure is as follows:- The jaw c is adjusted relative to the other jaw 12 by means of the wedge 20 and the screw 29 until a threaded test piece having a diameter of exactly .998 will just fail to pass between the rear edges 23 of the jaw faces, and a second test piece of 8X1 actly one inch diameter will just slide past the forwardedge 22 of the groove 21. The taper of the jaws relative to one another between the .edges 22, 23, and which may be respectively referred to 'as the go and not go points, will now be equal to the working allowance, namely .002". The

threaded member to be gauged is now inserted between the jaws, and the lead of the thread will cause the member I) to move transversely, it being guided in this movement by the tongue and groove arrangement 14, 15. If the threaded member can be moved past the go point 22, but not past the not go point 23, it is necessarily within the limits of tolerance; The exact size of the threaded member can be determined by noting on the scale 24; that point at which the threaded member closely fits between the jaws. By holding the gauge between a source of light and the eye and sighting along the serrations, it can be readily de termined whether each of the convolutions of the thread is accurate as to shape and size. Since each of the jaw faces has a rela-- tively large number of serrations, permitting of measurement of the threaded memher for a considerable distance, any errors in the pitch of the threaded member will become immediately apparent. It is evident that by adjusting the wedge 20 and the screw 29. wear between the jaw faces may be readily taken up, and the inclination of these faces relative to one another may be varied in accordance with changes'in working allowances. that the handle or connecting portion of the frame is at an angle, say 45, to the length of the serrations so that this handle does not obstruct the light in the line of' the serrations, nor interfere with the insertion of a relatively long threaded member between the aws.

In the embodiment shown in Fig. 4, the jaw 12 is similar to the jaw 12 of the previous embodiment, and is mounted .for transverse movement.- The opposing jaw It will further be seen in the opposite direction; that is to say, if i the gauge is constructed to gauge right handed screw threads, the sections 0' have serrations or teeth comprising segments of a left hand screw, and vice versa.

A'ssociated with each section 0 is awedge 20 adapted to be adjusted by a screw 27' so that the sections 0 may be adjusted relative to the jaw I) to establish the specified lim-- its of tolerance, and to take up wear. The sections '0 are secured to the head 10 by bolts 30, it being understood that the wedges 20 are provided with slots through which these bolts extend.

It will be understood that with the gauge constructed in accordance with the embodiment of Fig. 4, the front section 0' will be adjusted so that the distance between the high point ofthe active face of this section and the jaw face of the member I) will be equal to the specified maximum limit of accuracy of the thread to be gauged and the distance between the high point of 'the rear section 0 and the face of the jaw member b will equal the specified minimum limit of accuracy. In one manner of speaking, the active faces of the sections 0 col lectively constituted a jaw opposed to the other jaw b. By adjusting these sections the plane of the active gauging surfaces thereof, as indicated by the line pp, may

be adjusted angularly relative to the opposing jaw b.

It is obvious that the invention is suscepv tible of various modifications and changes which are Within the spirit of the invention without departing from the scope of the following claims; for instance, the jaw member I) in the embodiment of Fig. 4 in stead of being in the form of a single block may be constituted of a pair of sections similar to scctlons 0'.

It is to be understood that the present disclosure of the invention is by way of illustration only and is not to be taken as restrictive of my conception.

The. detailed construction of the embodiment shown in Fig. 4 is reserved for a separate application.

I claim as my invention a 1. A. gauge provided with -,a pair of opposed jaw faces, each having a plurality of serrations corresponding in cross section to the groove of a threaded member and spaced apart in accordance with the pitch thereof, the serrations of one face being laterally inclined to those of the other face,

said jaw faces being inclined towards each 'other'longitudin-ally of said serrations.

2. A gauge provided with a pair of opposed jaw f-aces inclined towards each other and each having a plurality of serrations extending in the general direction of inclination of said faces with the serrations of one face laterally inclined to the serrations of the other face and transverse edges on said faces denoting the points past which a threaded member should go to be within predetermined limits of accuracy.

3. A gauge provided with a pair of opposed jaw faces inclined towards each other, each having a plurality of serrations extending in the general direction of inclination of saidfaces, one of said faces being transversely grooved between its ends to provide a, gauging edge.

4. A gauge comprising a pair of cooperating gauging members each of which has a plurality of gauging points, one of said members being mounted for transverse movement during the gaging operation.

5. A gauge comprising a pair of cooperating gauging members each of which has a plurality of gauging points, one of said members being mounted for transverse movement during the gaging operation, and one of said members being mounted for angular movement.

6. A gauge provided with a pair of opposed jaw faces each having a plurality of serrations, the serrations of one face being inclined to those of the other in accordance with the angle between diametrically opposite portions of a thread to be gauged, one of said jaws being mounted for transverse movement.

7. A gauge provided with'a frame, a pair of jaw members mounted thereon with their opposed faces provided with a plurality of serrations, the serrations of' one jaw face being inclined to those of the other face in accordance with the angle between diametrically opposite portions of a thread to be gauged, said jaw faces being inclined towards each other in the direction of the length of said serrations, one of said jaw members being supported on said frame for transverse sliding movement.

8. A gauge provided with a pair of. opposed jaw faces, and means for angularly adjusting one of said faces relative to the other, one of said faces being transversely grooved to provide a gauging edge.

9. A gauge provided with a pair of opposed jaw faces, each having a plurality of serrations, the serrations of one face being laterally inclined to those of the other, and means for angularly adjusting said faces relative to one another.

10. A gauge provided with a pair of opposed jaw faces, each having a plurality of serrations, the serrations of one face being laterally inclined to those of the other face, means for angularly adjusting said faces relative to one another in the general direction of the length of said serrations, and

spaced gauging points spaced along said serrations.

11. A gauge provided with a pair of opposed jaw faces, each rovided with a plurality of serrations, tlie serrations of one face being laterally inclined to .those of the other in accordance with the angle between diametrically opposite portions of a threaded member to be gauged, means for angularly adjusting said faces one relative to the other, means for guiding one of said members transversely, and transverse edges on on of said faces and spaced apart longitudinally thereof for denoting the points past which a member should and should not go to be within predetermined limits of accuracy.

12. A gauge provided with a frame, jaw

members thereon having opposed jaw sur faces provided with plurality of serrations and a wedge interposed between said frame and one of said members and movable transversely of the serrations-thereof for angularly adjusting said member relative to the other one.

13. A gauge provided with a frame, opposed jaws thereon, an adjustable fulcrum on said frame for one of said jaws, and.a wedge between said frame and. said last mentioned jaw for adjusting the latter.

14. A gauge provided with a frame, opposcd jaws, means for securing one of said jaws to said frame for angular adjustment, an adjustable screw. carried by said frame and supporting one end of said last mentioned jaw, and an adjustable wedge interposed between said frame and the other end of said jaw.

15. A gauge comprising a frame having a connecting portion and oppositely positioned heads carried thereby, gauging members on opposing faces of said heads, said gaugin members having thread gauging faces. dlsposedwith their lengths extending transversely of the plane of said connecting portion. a

'16. In a gauge, a C-frame, and a. pair of jaw members carried thereby and each provided with serrations extending transversely of the plane of the connecting portion of said frame. i

17. A gauge provided with a frame, jaw members thereon having opposed jaw faces having a plurality of serrations, means for securing one of said jaw members to said frame for angular movement, an adjustable screw carried by said frame and supporting one end of said last mentioned jaw member, and an adjustable wedge interposed between said frame and the other end of said member and movable" transversely 'of the serrations of the latter.

BENGT M. W. HANSON. 

